Neurocutaneous Melanosis with Hydrocephalus and Dandy-Walker Variant.

Neurocutaneous melanosis (NCM) is one of the rare, congenital, noninheritable phakomatoses characterized by the presence of large and/or multiple congenital melanocytic cutaneous nevi associated with intracranial leptomeningeal melanocytosis. NCM usually presents before 2 years of age. So far 302 cases have been reported in literature.